<?php
if (! defined('INIT'))
    exit('Access Denied');

class Browser
{

    private $_agent = '';

    private $_browser_name = '';

    private $_version = '';

    private $_platform = '';

    private $_os = '';

    private $_is_aol = false;

    private $_is_mobile = false;

    private $_is_tablet = false;

    private $_is_robot = false;

    private $_is_facebook = false;

    private $_aol_version = '';

    const BROWSER_UNKNOWN = 'unknown';

    const VERSION_UNKNOWN = 'unknown';

    const BROWSER_OPERA = 'Opera';
 // http://www.opera.com/
    const BROWSER_OPERA_MINI = 'Opera Mini';
 // http://www.opera.com/mini/
    const BROWSER_WEBTV = 'WebTV';
 // http://www.webtv.net/pc/
    const BROWSER_IE = 'Internet Explorer';
 // http://www.microsoft.com/ie/
    const BROWSER_POCKET_IE = 'Pocket Internet Explorer';
 // http://en.wikipedia.org/wiki/Internet_Explorer_Mobile
    const BROWSER_KONQUEROR = 'Konqueror';
 // http://www.konqueror.org/
    const BROWSER_ICAB = 'iCab';
 // http://www.icab.de/
    const BROWSER_OMNIWEB = 'OmniWeb';
 // http://www.omnigroup.com/applications/omniweb/
    const BROWSER_FIREBIRD = 'Firebird';
 // http://www.ibphoenix.com/
    const BROWSER_FIREFOX = 'Firefox';
 // http://www.mozilla.com/en-US/firefox/firefox.html
    const BROWSER_ICEWEASEL = 'Iceweasel';
 // http://www.geticeweasel.org/
    const BROWSER_SHIRETOKO = 'Shiretoko';
 // http://wiki.mozilla.org/Projects/shiretoko
    const BROWSER_MOZILLA = 'Mozilla';
 // http://www.mozilla.com/en-US/
    const BROWSER_AMAYA = 'Amaya';
 // http://www.w3.org/Amaya/
    const BROWSER_LYNX = 'Lynx';
 // http://en.wikipedia.org/wiki/Lynx
    const BROWSER_SAFARI = 'Safari';
 // http://apple.com
    const BROWSER_IPHONE = 'iPhone';
 // http://apple.com
    const BROWSER_IPOD = 'iPod';
 // http://apple.com
    const BROWSER_IPAD = 'iPad';
 // http://apple.com
    const BROWSER_CHROME = 'Chrome';
 // http://www.google.com/chrome
    const BROWSER_ANDROID = 'Android';
 // http://www.android.com/
    const BROWSER_GOOGLEBOT = 'GoogleBot';
 // http://en.wikipedia.org/wiki/Googlebot
    const BROWSER_SLURP = 'Yahoo! Slurp';
 // http://en.wikipedia.org/wiki/Yahoo!_Slurp
    const BROWSER_W3CVALIDATOR = 'W3C Validator';
 // http://validator.w3.org/
    const BROWSER_BLACKBERRY = 'BlackBerry';
 // http://www.blackberry.com/
    const BROWSER_ICECAT = 'IceCat';
 // http://en.wikipedia.org/wiki/GNU_IceCat
    const BROWSER_NOKIA_S60 = 'Nokia S60 OSS Browser';
 // http://en.wikipedia.org/wiki/Web_Browser_for_S60
    const BROWSER_NOKIA = 'Nokia Browser';
 // * all other WAP-based browsers on the Nokia Platform
    const BROWSER_MSN = 'MSN Browser';
 // http://explorer.msn.com/
    const BROWSER_MSNBOT = 'MSN Bot';
 // http://search.msn.com/msnbot.htm
    const BROWSER_BINGBOT = 'Bing Bot';
 // http://en.wikipedia.org/wiki/Bingbot
    const BROWSER_NETSCAPE_NAVIGATOR = 'Netscape Navigator';
 // http://browser.netscape.com/ (DEPRECATED)
    const BROWSER_GALEON = 'Galeon';
 // http://galeon.sourceforge.net/ (DEPRECATED)
    const BROWSER_NETPOSITIVE = 'NetPositive';
 // http://en.wikipedia.org/wiki/NetPositive (DEPRECATED)
    const BROWSER_PHOENIX = 'Phoenix';
 // http://en.wikipedia.org/wiki/History_of_Mozilla_Firefox (DEPRECATED)
    const PLATFORM_UNKNOWN = 'unknown';

    const PLATFORM_WINDOWS = 'Windows';

    const PLATFORM_WINDOWS_CE = 'Windows CE';

    const PLATFORM_APPLE = 'Apple';

    const PLATFORM_LINUX = 'Linux';

    const PLATFORM_OS2 = 'OS/2';

    const PLATFORM_BEOS = 'BeOS';

    const PLATFORM_IPHONE = 'iPhone';

    const PLATFORM_IPOD = 'iPod';

    const PLATFORM_IPAD = 'iPad';

    const PLATFORM_BLACKBERRY = 'BlackBerry';

    const PLATFORM_NOKIA = 'Nokia';

    const PLATFORM_FREEBSD = 'FreeBSD';

    const PLATFORM_OPENBSD = 'OpenBSD';

    const PLATFORM_NETBSD = 'NetBSD';

    const PLATFORM_SUNOS = 'SunOS';

    const PLATFORM_OPENSOLARIS = 'OpenSolaris';

    const PLATFORM_ANDROID = 'Android';

    const OPERATING_SYSTEM_UNKNOWN = 'unknown';

    public function Browser($userAgent = "")
    {
        $this->reset();
        if ($userAgent != "") {
            $this->setUserAgent($userAgent);
        } else {
            $this->determine();
        }
    }

    /**
     * Reset all properties
     */
    public function reset()
    {
        $this->_agent = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : "";
        $this->_browser_name = self::BROWSER_UNKNOWN;
        $this->_version = self::VERSION_UNKNOWN;
        $this->_platform = self::PLATFORM_UNKNOWN;
        $this->_os = self::OPERATING_SYSTEM_UNKNOWN;
        $this->_is_aol = false;
        $this->_is_mobile = false;
        $this->_is_tablet = false;
        $this->_is_robot = false;
        $this->_is_facebook = false;
        $this->_aol_version = self::VERSION_UNKNOWN;
    }

    /**
     * Check to see if the specific browser is valid
     * 
     * @param string $browserName            
     * @return bool True if the browser is the specified browser
     */
    function isBrowser($browserName)
    {
        return (0 == strcasecmp($this->_browser_name, trim($browserName)));
    }

    /**
     * The name of the browser.
     * All return types are from the class contants
     * 
     * @return string Name of the browser
     */
    public function getBrowser()
    {
        return $this->_browser_name;
    }

    /**
     * Set the name of the browser
     * 
     * @param $browser string
     *            The name of the Browser
     */
    public function setBrowser($browser)
    {
        $this->_browser_name = $browser;
    }

    /**
     * The name of the platform.
     * All return types are from the class contants
     * 
     * @return string Name of the browser
     */
    public function getPlatform()
    {
        return $this->_platform;
    }

    /**
     * Set the name of the platform
     * 
     * @param string $platform
     *            The name of the Platform
     */
    public function setPlatform($platform)
    {
        $this->_platform = $platform;
    }

    /**
     * The version of the browser.
     * 
     * @return string Version of the browser (will only contain alpha-numeric characters and a period)
     */
    public function getVersion()
    {
        return $this->_version;
    }

    /**
     * Set the version of the browser
     * 
     * @param string $version
     *            The version of the Browser
     */
    public function setVersion($version)
    {
        $this->_version = preg_replace('/[^0-9,.,a-z,A-Z-]/', '', $version);
    }

    /**
     * The version of AOL.
     * 
     * @return string Version of AOL (will only contain alpha-numeric characters and a period)
     */
    public function getAolVersion()
    {
        return $this->_aol_version;
    }

    /**
     * Set the version of AOL
     * 
     * @param string $version
     *            The version of AOL
     */
    public function setAolVersion($version)
    {
        $this->_aol_version = preg_replace('/[^0-9,.,a-z,A-Z]/', '', $version);
    }

    /**
     * Is the browser from AOL?
     * 
     * @return boolean True if the browser is from AOL otherwise false
     */
    public function isAol()
    {
        return $this->_is_aol;
    }

    /**
     * Is the browser from a mobile device?
     * 
     * @return boolean True if the browser is from a mobile device otherwise false
     */
    public function isMobile()
    {
        return $this->_is_mobile;
    }

    /**
     * Is the browser from a tablet device?
     * 
     * @return boolean True if the browser is from a tablet device otherwise false
     */
    public function isTablet()
    {
        return $this->_is_tablet;
    }

    /**
     * Is the browser from a robot (ex Slurp,GoogleBot)?
     * 
     * @return boolean True if the browser is from a robot otherwise false
     */
    public function isRobot()
    {
        return $this->_is_robot;
    }

    /**
     * Is the browser from facebook?
     * 
     * @return boolean True if the browser is from facebook otherwise false
     */
    public function isFacebook()
    {
        return $this->_is_facebook;
    }

    /**
     * Set the browser to be from AOL
     * 
     * @param
     *            $isAol
     */
    public function setAol($isAol)
    {
        $this->_is_aol = $isAol;
    }

    /**
     * Set the Browser to be mobile
     * 
     * @param boolean $value
     *            is the browser a mobile browser or not
     */
    protected function setMobile($value = true)
    {
        $this->_is_mobile = $value;
    }

    /**
     * Set the Browser to be tablet
     * 
     * @param boolean $value
     *            is the browser a tablet browser or not
     */
    protected function setTablet($value = true)
    {
        $this->_is_tablet = $value;
    }

    /**
     * Set the Browser to be a robot
     * 
     * @param boolean $value
     *            is the browser a robot or not
     */
    protected function setRobot($value = true)
    {
        $this->_is_robot = $value;
    }

    /**
     * Set the Browser to be a Facebook request
     * 
     * @param boolean $value
     *            is the browser a robot or not
     */
    protected function setFacebook($value = true)
    {
        $this->_is_facebook = $value;
    }

    /**
     * Get the user agent value in use to determine the browser
     * 
     * @return string The user agent from the HTTP header
     */
    public function getUserAgent()
    {
        return $this->_agent;
    }

    /**
     * Set the user agent value (the construction will use the HTTP header value - this will overwrite it)
     * 
     * @param string $agent_string
     *            The value for the User Agent
     */
    public function setUserAgent($agent_string)
    {
        $this->reset();
        $this->_agent = $agent_string;
        $this->determine();
    }

    /**
     * Used to determine if the browser is actually "chromeframe"
     * 
     * @since 1.7
     * @return boolean True if the browser is using chromeframe
     */
    public function isChromeFrame()
    {
        return (strpos($this->_agent, "chromeframe") !== false);
    }

    /**
     * Returns a formatted string with a summary of the details of the browser.
     * 
     * @return string formatted string with a summary of the browser
     */
    public function __toString()
    {
        return "<strong>Browser Name:</strong> {$this->getBrowser()}<br/>\n" . "<strong>Browser Version:</strong> {$this->getVersion()}<br/>\n" . "<strong>Browser User Agent String:</strong> {$this->getUserAgent()}<br/>\n" . "<strong>Platform:</strong> {$this->getPlatform()}<br/>";
    }

    /**
     * Protected routine to calculate and determine what the browser is in use (including platform)
     */
    protected function determine()
    {
        $this->checkPlatform();
        $this->checkBrowsers();
        $this->checkForAol();
    }

    /**
     * Protected routine to determine the browser type
     * 
     * @return boolean True if the browser was detected otherwise false
     */
    protected function checkBrowsers()
    {
        return (
        // well-known, well-used
        // Special Notes:
        // (1) Opera must be checked before FireFox due to the odd
        // user agents used in some older versions of Opera
        // (2) WebTV is strapped onto Internet Explorer so we must
        // check for WebTV before IE
        // (3) (deprecated) Galeon is based on Firefox and needs to be
        // tested before Firefox is tested
        // (4) OmniWeb is based on Safari so OmniWeb check must occur
        // before Safari
        // (5) Netscape 9+ is based on Firefox so Netscape checks
        // before FireFox are necessary
        $this->checkBrowserWebTv() || $this->checkBrowserInternetExplorer() || $this->checkBrowserOpera() || $this->checkBrowserGaleon() || $this->checkBrowserNetscapeNavigator9Plus() || $this->checkBrowserFirefox() || $this->checkBrowserChrome() || $this->checkBrowserOmniWeb() || 
        
        // common mobile
        $this->checkBrowserAndroid() || $this->checkBrowseriPad() || $this->checkBrowseriPod() || $this->checkBrowseriPhone() || $this->checkBrowserBlackBerry() || $this->checkBrowserNokia() || 
        
        // common bots
        $this->checkBrowserGoogleBot() || $this->checkBrowserMSNBot() || $this->checkBrowserBingBot() || $this->checkBrowserSlurp() || 
        
        // check for facebook external hit when loading URL
        $this->checkFacebookExternalHit() || 
        
        // WebKit base check (post mobile and others)
        $this->checkBrowserSafari() || 
        
        // everyone else
        $this->checkBrowserNetPositive() || $this->checkBrowserFirebird() || $this->checkBrowserKonqueror() || $this->checkBrowserIcab() || $this->checkBrowserPhoenix() || $this->checkBrowserAmaya() || $this->checkBrowserLynx() || $this->checkBrowserShiretoko() || $this->checkBrowserIceCat() || $this->checkBrowserIceweasel() || $this->checkBrowserW3CValidator() || $this->checkBrowserMozilla() /* Mozilla is such an open standard that you must check it last */
        );
    }

    /**
     * Determine if the user is using a BlackBerry (last updated 1.7)
     * 
     * @return boolean True if the browser is the BlackBerry browser otherwise false
     */
    protected function checkBrowserBlackBerry()
    {
        if (stripos($this->_agent, 'blackberry') !== false) {
            $aresult = explode("/", stristr($this->_agent, "BlackBerry"));
            $aversion = explode(' ', $aresult[1]);
            $this->setVersion($aversion[0]);
            $this->_browser_name = self::BROWSER_BLACKBERRY;
            $this->setMobile(true);
            return true;
        }
        return false;
    }

    /**
     * Determine if the user is using an AOL User Agent (last updated 1.7)
     * 
     * @return boolean True if the browser is from AOL otherwise false
     */
    protected function checkForAol()
    {
        $this->setAol(false);
        $this->setAolVersion(self::VERSION_UNKNOWN);
        
        if (stripos($this->_agent, 'aol') !== false) {
            $aversion = explode(' ', stristr($this->_agent, 'AOL'));
            $this->setAol(true);
            $this->setAolVersion(preg_replace('/[^0-9\.a-z]/i', '', $aversion[1]));
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is the GoogleBot or not (last updated 1.7)
     * 
     * @return boolean True if the browser is the GoogletBot otherwise false
     */
    protected function checkBrowserGoogleBot()
    {
        if (stripos($this->_agent, 'googlebot') !== false) {
            $aresult = explode('/', stristr($this->_agent, 'googlebot'));
            $aversion = explode(' ', $aresult[1]);
            $this->setVersion(str_replace(';', '', $aversion[0]));
            $this->_browser_name = self::BROWSER_GOOGLEBOT;
            $this->setRobot(true);
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is the MSNBot or not (last updated 1.9)
     * 
     * @return boolean True if the browser is the MSNBot otherwise false
     */
    protected function checkBrowserMSNBot()
    {
        if (stripos($this->_agent, "msnbot") !== false) {
            $aresult = explode("/", stristr($this->_agent, "msnbot"));
            $aversion = explode(" ", $aresult[1]);
            $this->setVersion(str_replace(";", "", $aversion[0]));
            $this->_browser_name = self::BROWSER_MSNBOT;
            $this->setRobot(true);
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is the BingBot or not (last updated 1.9)
     * 
     * @return boolean True if the browser is the BingBot otherwise false
     */
    protected function checkBrowserBingBot()
    {
        if (stripos($this->_agent, "bingbot") !== false) {
            $aresult = explode("/", stristr($this->_agent, "bingbot"));
            $aversion = explode(" ", $aresult[1]);
            $this->setVersion(str_replace(";", "", $aversion[0]));
            $this->_browser_name = self::BROWSER_BINGBOT;
            $this->setRobot(true);
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is the W3C Validator or not (last updated 1.7)
     * 
     * @return boolean True if the browser is the W3C Validator otherwise false
     */
    protected function checkBrowserW3CValidator()
    {
        if (stripos($this->_agent, 'W3C-checklink') !== false) {
            $aresult = explode('/', stristr($this->_agent, 'W3C-checklink'));
            $aversion = explode(' ', $aresult[1]);
            $this->setVersion($aversion[0]);
            $this->_browser_name = self::BROWSER_W3CVALIDATOR;
            return true;
        } else 
            if (stripos($this->_agent, 'W3C_Validator') !== false) {
                // Some of the Validator versions do not delineate w/ a slash - add it back in
                $ua = str_replace("W3C_Validator ", "W3C_Validator/", $this->_agent);
                $aresult = explode('/', stristr($ua, 'W3C_Validator'));
                $aversion = explode(' ', $aresult[1]);
                $this->setVersion($aversion[0]);
                $this->_browser_name = self::BROWSER_W3CVALIDATOR;
                return true;
            } else 
                if (stripos($this->_agent, 'W3C-mobileOK') !== false) {
                    $this->_browser_name = self::BROWSER_W3CVALIDATOR;
                    $this->setMobile(true);
                    return true;
                }
        return false;
    }

    /**
     * Determine if the browser is the Yahoo! Slurp Robot or not (last updated 1.7)
     * 
     * @return boolean True if the browser is the Yahoo! Slurp Robot otherwise false
     */
    protected function checkBrowserSlurp()
    {
        if (stripos($this->_agent, 'slurp') !== false) {
            $aresult = explode('/', stristr($this->_agent, 'Slurp'));
            $aversion = explode(' ', $aresult[1]);
            $this->setVersion($aversion[0]);
            $this->_browser_name = self::BROWSER_SLURP;
            $this->setRobot(true);
            $this->setMobile(false);
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is Internet Explorer or not (last updated 1.7)
     * 
     * @return boolean True if the browser is Internet Explorer otherwise false
     */
    protected function checkBrowserInternetExplorer()
    {
        
        // Test for v1 - v1.5 IE
        if (stripos($this->_agent, 'microsoft internet explorer') !== false) {
            $this->setBrowser(self::BROWSER_IE);
            $this->setVersion('1.0');
            $aresult = stristr($this->_agent, '/');
            if (preg_match('/308|425|426|474|0b1/i', $aresult)) {
                $this->setVersion('1.5');
            }
            return true;
        }  // Test for versions > 1.5
else 
            if (stripos($this->_agent, 'msie') !== false && stripos($this->_agent, 'opera') === false) {
                // See if the browser is the odd MSN Explorer
                if (stripos($this->_agent, 'msnb') !== false) {
                    $aresult = explode(' ', stristr(str_replace(';', '; ', $this->_agent), 'MSN'));
                    $this->setBrowser(self::BROWSER_MSN);
                    $this->setVersion(str_replace(array(
                        '(',
                        ')',
                        ';'
                    ), '', $aresult[1]));
                    return true;
                }
                $aresult = explode(' ', stristr(str_replace(';', '; ', $this->_agent), 'msie'));
                $this->setBrowser(self::BROWSER_IE);
                $this->setVersion(str_replace(array(
                    '(',
                    ')',
                    ';'
                ), '', $aresult[1]));
                if (stripos($this->_agent, 'IEMobile') !== false) {
                    $this->setBrowser(self::BROWSER_POCKET_IE);
                    $this->setMobile(true);
                }
                return true;
            }  // Test for versions > IE 10
else 
                if (stripos($this->_agent, 'trident') !== false) {
                    $this->setBrowser(self::BROWSER_IE);
                    $result = explode('rv:', $this->_agent);
                    $this->setVersion(preg_replace('/[^0-9.]+/', '', $result[1]));
                    $this->_agent = str_replace(array(
                        "Mozilla",
                        "Gecko"
                    ), "MSIE", $this->_agent);
                }  // Test for Pocket IE
else 
                    if (stripos($this->_agent, 'mspie') !== false || stripos($this->_agent, 'pocket') !== false) {
                        $aresult = explode(' ', stristr($this->_agent, 'mspie'));
                        $this->setPlatform(self::PLATFORM_WINDOWS_CE);
                        $this->setBrowser(self::BROWSER_POCKET_IE);
                        $this->setMobile(true);
                        
                        if (stripos($this->_agent, 'mspie') !== false) {
                            $this->setVersion($aresult[1]);
                        } else {
                            $aversion = explode('/', $this->_agent);
                            $this->setVersion($aversion[1]);
                        }
                        return true;
                    }
        return false;
    }

    /**
     * Determine if the browser is Opera or not (last updated 1.7)
     * 
     * @return boolean True if the browser is Opera otherwise false
     */
    protected function checkBrowserOpera()
    {
        if (stripos($this->_agent, 'opera mini') !== false) {
            $resultant = stristr($this->_agent, 'opera mini');
            if (preg_match('/\//', $resultant)) {
                $aresult = explode('/', $resultant);
                $aversion = explode(' ', $aresult[1]);
                $this->setVersion($aversion[0]);
            } else {
                $aversion = explode(' ', stristr($resultant, 'opera mini'));
                $this->setVersion($aversion[1]);
            }
            $this->_browser_name = self::BROWSER_OPERA_MINI;
            $this->setMobile(true);
            return true;
        } else 
            if (stripos($this->_agent, 'opera') !== false) {
                $resultant = stristr($this->_agent, 'opera');
                if (preg_match('/Version\/(1*.*)$/', $resultant, $matches)) {
                    $this->setVersion($matches[1]);
                } else 
                    if (preg_match('/\//', $resultant)) {
                        $aresult = explode('/', str_replace("(", " ", $resultant));
                        $aversion = explode(' ', $aresult[1]);
                        $this->setVersion($aversion[0]);
                    } else {
                        $aversion = explode(' ', stristr($resultant, 'opera'));
                        $this->setVersion(isset($aversion[1]) ? $aversion[1] : "");
                    }
                if (stripos($this->_agent, 'Opera Mobi') !== false) {
                    $this->setMobile(true);
                }
                $this->_browser_name = self::BROWSER_OPERA;
                return true;
            } else 
                if (stripos($this->_agent, 'OPR') !== false) {
                    $resultant = stristr($this->_agent, 'OPR');
                    if (preg_match('/\//', $resultant)) {
                        $aresult = explode('/', str_replace("(", " ", $resultant));
                        $aversion = explode(' ', $aresult[1]);
                        $this->setVersion($aversion[0]);
                    }
                    if (stripos($this->_agent, 'Mobile') !== false) {
                        $this->setMobile(true);
                    }
                    $this->_browser_name = self::BROWSER_OPERA;
                    return true;
                }
        return false;
    }

    /**
     * Determine if the browser is Chrome or not (last updated 1.7)
     * 
     * @return boolean True if the browser is Chrome otherwise false
     */
    protected function checkBrowserChrome()
    {
        if (stripos($this->_agent, 'Chrome') !== false) {
            $aresult = explode('/', stristr($this->_agent, 'Chrome'));
            $aversion = explode(' ', $aresult[1]);
            $this->setVersion($aversion[0]);
            $this->setBrowser(self::BROWSER_CHROME);
            // Chrome on Android
            if (stripos($this->_agent, 'Android') !== false) {
                if (stripos($this->_agent, 'Mobile') !== false) {
                    $this->setMobile(true);
                } else {
                    $this->setTablet(true);
                }
            }
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is WebTv or not (last updated 1.7)
     * 
     * @return boolean True if the browser is WebTv otherwise false
     */
    protected function checkBrowserWebTv()
    {
        if (stripos($this->_agent, 'webtv') !== false) {
            $aresult = explode('/', stristr($this->_agent, 'webtv'));
            $aversion = explode(' ', $aresult[1]);
            $this->setVersion($aversion[0]);
            $this->setBrowser(self::BROWSER_WEBTV);
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is NetPositive or not (last updated 1.7)
     * 
     * @return boolean True if the browser is NetPositive otherwise false
     */
    protected function checkBrowserNetPositive()
    {
        if (stripos($this->_agent, 'NetPositive') !== false) {
            $aresult = explode('/', stristr($this->_agent, 'NetPositive'));
            $aversion = explode(' ', $aresult[1]);
            $this->setVersion(str_replace(array(
                '(',
                ')',
                ';'
            ), '', $aversion[0]));
            $this->setBrowser(self::BROWSER_NETPOSITIVE);
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is Galeon or not (last updated 1.7)
     * 
     * @return boolean True if the browser is Galeon otherwise false
     */
    protected function checkBrowserGaleon()
    {
        if (stripos($this->_agent, 'galeon') !== false) {
            $aresult = explode(' ', stristr($this->_agent, 'galeon'));
            $aversion = explode('/', $aresult[0]);
            $this->setVersion($aversion[1]);
            $this->setBrowser(self::BROWSER_GALEON);
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is Konqueror or not (last updated 1.7)
     * 
     * @return boolean True if the browser is Konqueror otherwise false
     */
    protected function checkBrowserKonqueror()
    {
        if (stripos($this->_agent, 'Konqueror') !== false) {
            $aresult = explode(' ', stristr($this->_agent, 'Konqueror'));
            $aversion = explode('/', $aresult[0]);
            $this->setVersion($aversion[1]);
            $this->setBrowser(self::BROWSER_KONQUEROR);
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is iCab or not (last updated 1.7)
     * 
     * @return boolean True if the browser is iCab otherwise false
     */
    protected function checkBrowserIcab()
    {
        if (stripos($this->_agent, 'icab') !== false) {
            $aversion = explode(' ', stristr(str_replace('/', ' ', $this->_agent), 'icab'));
            $this->setVersion($aversion[1]);
            $this->setBrowser(self::BROWSER_ICAB);
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is OmniWeb or not (last updated 1.7)
     * 
     * @return boolean True if the browser is OmniWeb otherwise false
     */
    protected function checkBrowserOmniWeb()
    {
        if (stripos($this->_agent, 'omniweb') !== false) {
            $aresult = explode('/', stristr($this->_agent, 'omniweb'));
            $aversion = explode(' ', isset($aresult[1]) ? $aresult[1] : "");
            $this->setVersion($aversion[0]);
            $this->setBrowser(self::BROWSER_OMNIWEB);
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is Phoenix or not (last updated 1.7)
     * 
     * @return boolean True if the browser is Phoenix otherwise false
     */
    protected function checkBrowserPhoenix()
    {
        if (stripos($this->_agent, 'Phoenix') !== false) {
            $aversion = explode('/', stristr($this->_agent, 'Phoenix'));
            $this->setVersion($aversion[1]);
            $this->setBrowser(self::BROWSER_PHOENIX);
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is Firebird or not (last updated 1.7)
     * 
     * @return boolean True if the browser is Firebird otherwise false
     */
    protected function checkBrowserFirebird()
    {
        if (stripos($this->_agent, 'Firebird') !== false) {
            $aversion = explode('/', stristr($this->_agent, 'Firebird'));
            $this->setVersion($aversion[1]);
            $this->setBrowser(self::BROWSER_FIREBIRD);
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is Netscape Navigator 9+ or not (last updated 1.7)
     * NOTE: (http://browser.netscape.com/ - Official support ended on March 1st, 2008)
     * 
     * @return boolean True if the browser is Netscape Navigator 9+ otherwise false
     */
    protected function checkBrowserNetscapeNavigator9Plus()
    {
        if (stripos($this->_agent, 'Firefox') !== false && preg_match('/Navigator\/([^ ]*)/i', $this->_agent, $matches)) {
            $this->setVersion($matches[1]);
            $this->setBrowser(self::BROWSER_NETSCAPE_NAVIGATOR);
            return true;
        } else 
            if (stripos($this->_agent, 'Firefox') === false && preg_match('/Netscape6?\/([^ ]*)/i', $this->_agent, $matches)) {
                $this->setVersion($matches[1]);
                $this->setBrowser(self::BROWSER_NETSCAPE_NAVIGATOR);
                return true;
            }
        return false;
    }

    /**
     * Determine if the browser is Shiretoko or not (https://wiki.mozilla.org/Projects/shiretoko) (last updated 1.7)
     * 
     * @return boolean True if the browser is Shiretoko otherwise false
     */
    protected function checkBrowserShiretoko()
    {
        if (stripos($this->_agent, 'Mozilla') !== false && preg_match('/Shiretoko\/([^ ]*)/i', $this->_agent, $matches)) {
            $this->setVersion($matches[1]);
            $this->setBrowser(self::BROWSER_SHIRETOKO);
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is Ice Cat or not (http://en.wikipedia.org/wiki/GNU_IceCat) (last updated 1.7)
     * 
     * @return boolean True if the browser is Ice Cat otherwise false
     */
    protected function checkBrowserIceCat()
    {
        if (stripos($this->_agent, 'Mozilla') !== false && preg_match('/IceCat\/([^ ]*)/i', $this->_agent, $matches)) {
            $this->setVersion($matches[1]);
            $this->setBrowser(self::BROWSER_ICECAT);
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is Nokia or not (last updated 1.7)
     * 
     * @return boolean True if the browser is Nokia otherwise false
     */
    protected function checkBrowserNokia()
    {
        if (preg_match("/Nokia([^\/]+)\/([^ SP]+)/i", $this->_agent, $matches)) {
            $this->setVersion($matches[2]);
            if (stripos($this->_agent, 'Series60') !== false || strpos($this->_agent, 'S60') !== false) {
                $this->setBrowser(self::BROWSER_NOKIA_S60);
            } else {
                $this->setBrowser(self::BROWSER_NOKIA);
            }
            $this->setMobile(true);
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is Firefox or not (last updated 1.7)
     * 
     * @return boolean True if the browser is Firefox otherwise false
     */
    protected function checkBrowserFirefox()
    {
        if (stripos($this->_agent, 'safari') === false) {
            if (preg_match("/Firefox[\/ \(]([^ ;\)]+)/i", $this->_agent, $matches)) {
                $this->setVersion($matches[1]);
                $this->setBrowser(self::BROWSER_FIREFOX);
                // Firefox on Android
                if (stripos($this->_agent, 'Android') !== false) {
                    if (stripos($this->_agent, 'Mobile') !== false) {
                        $this->setMobile(true);
                    } else {
                        $this->setTablet(true);
                    }
                }
                return true;
            } else 
                if (preg_match("/Firefox$/i", $this->_agent, $matches)) {
                    $this->setVersion("");
                    $this->setBrowser(self::BROWSER_FIREFOX);
                    return true;
                }
        }
        return false;
    }

    /**
     * Determine if the browser is Firefox or not (last updated 1.7)
     * 
     * @return boolean True if the browser is Firefox otherwise false
     */
    protected function checkBrowserIceweasel()
    {
        if (stripos($this->_agent, 'Iceweasel') !== false) {
            $aresult = explode('/', stristr($this->_agent, 'Iceweasel'));
            $aversion = explode(' ', $aresult[1]);
            $this->setVersion($aversion[0]);
            $this->setBrowser(self::BROWSER_ICEWEASEL);
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is Mozilla or not (last updated 1.7)
     * 
     * @return boolean True if the browser is Mozilla otherwise false
     */
    protected function checkBrowserMozilla()
    {
        if (stripos($this->_agent, 'mozilla') !== false && preg_match('/rv:[0-9].[0-9][a-b]?/i', $this->_agent) && stripos($this->_agent, 'netscape') === false) {
            $aversion = explode(' ', stristr($this->_agent, 'rv:'));
            preg_match('/rv:[0-9].[0-9][a-b]?/i', $this->_agent, $aversion);
            $this->setVersion(str_replace('rv:', '', $aversion[0]));
            $this->setBrowser(self::BROWSER_MOZILLA);
            return true;
        } else 
            if (stripos($this->_agent, 'mozilla') !== false && preg_match('/rv:[0-9]\.[0-9]/i', $this->_agent) && stripos($this->_agent, 'netscape') === false) {
                $aversion = explode('', stristr($this->_agent, 'rv:'));
                $this->setVersion(str_replace('rv:', '', $aversion[0]));
                $this->setBrowser(self::BROWSER_MOZILLA);
                return true;
            } else 
                if (stripos($this->_agent, 'mozilla') !== false && preg_match('/mozilla\/([^ ]*)/i', $this->_agent, $matches) && stripos($this->_agent, 'netscape') === false) {
                    $this->setVersion($matches[1]);
                    $this->setBrowser(self::BROWSER_MOZILLA);
                    return true;
                }
        return false;
    }

    /**
     * Determine if the browser is Lynx or not (last updated 1.7)
     * 
     * @return boolean True if the browser is Lynx otherwise false
     */
    protected function checkBrowserLynx()
    {
        if (stripos($this->_agent, 'lynx') !== false) {
            $aresult = explode('/', stristr($this->_agent, 'Lynx'));
            $aversion = explode(' ', (isset($aresult[1]) ? $aresult[1] : ""));
            $this->setVersion($aversion[0]);
            $this->setBrowser(self::BROWSER_LYNX);
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is Amaya or not (last updated 1.7)
     * 
     * @return boolean True if the browser is Amaya otherwise false
     */
    protected function checkBrowserAmaya()
    {
        if (stripos($this->_agent, 'amaya') !== false) {
            $aresult = explode('/', stristr($this->_agent, 'Amaya'));
            $aversion = explode(' ', $aresult[1]);
            $this->setVersion($aversion[0]);
            $this->setBrowser(self::BROWSER_AMAYA);
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is Safari or not (last updated 1.7)
     * 
     * @return boolean True if the browser is Safari otherwise false
     */
    protected function checkBrowserSafari()
    {
        if (stripos($this->_agent, 'Safari') !== false && stripos($this->_agent, 'iPhone') === false && stripos($this->_agent, 'iPod') === false) {
            
            $aresult = explode('/', stristr($this->_agent, 'Version'));
            if (isset($aresult[1])) {
                $aversion = explode(' ', $aresult[1]);
                $this->setVersion($aversion[0]);
            } else {
                $this->setVersion(self::VERSION_UNKNOWN);
            }
            $this->setBrowser(self::BROWSER_SAFARI);
            return true;
        }
        return false;
    }

    /**
     * Detect if URL is loaded from FacebookExternalHit
     * 
     * @return boolean True if it detects FacebookExternalHit otherwise false
     */
    protected function checkFacebookExternalHit()
    {
        if (stristr($this->_agent, 'FacebookExternalHit')) {
            $this->setRobot(true);
            $this->setFacebook(true);
            return true;
        }
        return false;
    }

    /**
     * Detect if URL is being loaded from internal Facebook browser
     * 
     * @return boolean True if it detects internal Facebook browser otherwise false
     */
    protected function checkForFacebookIos()
    {
        if (stristr($this->_agent, 'FBIOS')) {
            $this->setFacebook(true);
            return true;
        }
        return false;
    }

    /**
     * Detect Version for the Safari browser on iOS devices
     * 
     * @return boolean True if it detects the version correctly otherwise false
     */
    protected function getSafariVersionOnIos()
    {
        $aresult = explode('/', stristr($this->_agent, 'Version'));
        if (isset($aresult[1])) {
            $aversion = explode(' ', $aresult[1]);
            $this->setVersion($aversion[0]);
            return true;
        }
        return false;
    }

    /**
     * Detect Version for the Chrome browser on iOS devices
     * 
     * @return boolean True if it detects the version correctly otherwise false
     */
    protected function getChromeVersionOnIos()
    {
        $aresult = explode('/', stristr($this->_agent, 'CriOS'));
        if (isset($aresult[1])) {
            $aversion = explode(' ', $aresult[1]);
            $this->setVersion($aversion[0]);
            $this->setBrowser(self::BROWSER_CHROME);
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is iPhone or not (last updated 1.7)
     * 
     * @return boolean True if the browser is iPhone otherwise false
     */
    protected function checkBrowseriPhone()
    {
        if (stripos($this->_agent, 'iPhone') !== false) {
            $this->setVersion(self::VERSION_UNKNOWN);
            $this->setBrowser(self::BROWSER_IPHONE);
            $this->getSafariVersionOnIos();
            $this->getChromeVersionOnIos();
            $this->checkForFacebookIos();
            $this->setMobile(true);
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is iPad or not (last updated 1.7)
     * 
     * @return boolean True if the browser is iPad otherwise false
     */
    protected function checkBrowseriPad()
    {
        if (stripos($this->_agent, 'iPad') !== false) {
            $this->setVersion(self::VERSION_UNKNOWN);
            $this->setBrowser(self::BROWSER_IPAD);
            $this->getSafariVersionOnIos();
            $this->getChromeVersionOnIos();
            $this->checkForFacebookIos();
            $this->setTablet(true);
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is iPod or not (last updated 1.7)
     * 
     * @return boolean True if the browser is iPod otherwise false
     */
    protected function checkBrowseriPod()
    {
        if (stripos($this->_agent, 'iPod') !== false) {
            $this->setVersion(self::VERSION_UNKNOWN);
            $this->setBrowser(self::BROWSER_IPOD);
            $this->getSafariVersionOnIos();
            $this->getChromeVersionOnIos();
            $this->checkForFacebookIos();
            $this->setMobile(true);
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is Android or not (last updated 1.7)
     * 
     * @return boolean True if the browser is Android otherwise false
     */
    protected function checkBrowserAndroid()
    {
        if (stripos($this->_agent, 'Android') !== false) {
            $aresult = explode(' ', stristr($this->_agent, 'Android'));
            if (isset($aresult[1])) {
                $aversion = explode(' ', $aresult[1]);
                $this->setVersion($aversion[0]);
            } else {
                $this->setVersion(self::VERSION_UNKNOWN);
            }
            if (stripos($this->_agent, 'Mobile') !== false) {
                $this->setMobile(true);
            } else {
                $this->setTablet(true);
            }
            $this->setBrowser(self::BROWSER_ANDROID);
            return true;
        }
        return false;
    }

    /**
     * Determine the user's platform (last updated 1.7)
     */
    protected function checkPlatform()
    {
        if (stripos($this->_agent, 'windows') !== false) {
            $this->_platform = self::PLATFORM_WINDOWS;
        } else 
            if (stripos($this->_agent, 'iPad') !== false) {
                $this->_platform = self::PLATFORM_IPAD;
            } else 
                if (stripos($this->_agent, 'iPod') !== false) {
                    $this->_platform = self::PLATFORM_IPOD;
                } else 
                    if (stripos($this->_agent, 'iPhone') !== false) {
                        $this->_platform = self::PLATFORM_IPHONE;
                    } elseif (stripos($this->_agent, 'mac') !== false) {
                        $this->_platform = self::PLATFORM_APPLE;
                    } elseif (stripos($this->_agent, 'android') !== false) {
                        $this->_platform = self::PLATFORM_ANDROID;
                    } elseif (stripos($this->_agent, 'linux') !== false) {
                        $this->_platform = self::PLATFORM_LINUX;
                    } else 
                        if (stripos($this->_agent, 'Nokia') !== false) {
                            $this->_platform = self::PLATFORM_NOKIA;
                        } else 
                            if (stripos($this->_agent, 'BlackBerry') !== false) {
                                $this->_platform = self::PLATFORM_BLACKBERRY;
                            } elseif (stripos($this->_agent, 'FreeBSD') !== false) {
                                $this->_platform = self::PLATFORM_FREEBSD;
                            } elseif (stripos($this->_agent, 'OpenBSD') !== false) {
                                $this->_platform = self::PLATFORM_OPENBSD;
                            } elseif (stripos($this->_agent, 'NetBSD') !== false) {
                                $this->_platform = self::PLATFORM_NETBSD;
                            } elseif (stripos($this->_agent, 'OpenSolaris') !== false) {
                                $this->_platform = self::PLATFORM_OPENSOLARIS;
                            } elseif (stripos($this->_agent, 'SunOS') !== false) {
                                $this->_platform = self::PLATFORM_SUNOS;
                            } elseif (stripos($this->_agent, 'OS\/2') !== false) {
                                $this->_platform = self::PLATFORM_OS2;
                            } elseif (stripos($this->_agent, 'BeOS') !== false) {
                                $this->_platform = self::PLATFORM_BEOS;
                            } elseif (stripos($this->_agent, 'win') !== false) {
                                $this->_platform = self::PLATFORM_WINDOWS;
                            }
    }
}
?>
